Dr Frank Drake said the phasing out of analogue transmissions from television, radio and radar was making our planet electronically invisible from outer space.
FrankDrake博士声称由于电视、无线电和雷达越来越少采用模拟信号进行传输，这一过程使地球在地外文明的电子设备上逐渐隐形。
Dr Frank Drake said the phasing out of analogue transmissions from television, radio and radar was making our planet electronically invisible from outer space.
FrankDrake博士声称由于电视、无线电和雷达越来越少采用模拟信号进行传输，这一过程使地球在地外文明的电子设备上逐渐隐形。
应用推荐